#2250 VIC-20 NTSC crash bug

[ste]

VICE 3.10 gtk3/sdl2 (VIC-20 NTSC)
emulator crashes when a value of $80 or more is placed at $9000 (screen horizontal).

motocross racer (xonox)(cart)
$b711 - $86 $18 loaded into $9000,1
*cart image can be patched replacing $86 with $06.
but other games have same probem.

sky blazer (broderbund)(cart)
crashes when you try to center screen during play with cursor left.

[ste]

forgot to add cart image

[gpz]

Ticket moved from /p/vice-emu/patches/437/

[gpz]

Now the question is: what does a real VIC20 show in that case?

[ste]

not sure about that.
but the higher values work in PAL.
$80 seems to be a loop point. same screen position as $00
upto $AF = $2F
30$ moves graphics further, where $B0 doesn't (clears screen).